Amine-Catalyzed Cascade Synthesis of 3,4-Diunsubstituted Coumarins
作者:Jia Wei、Pengcheng Wang、Qianfa Jia、Jiaoyao Huang、Zhiyun Du、Kun Zhang、Jian Wang
DOI:10.1002/ejoc.201300538
日期:2013.7
We disclose an efficient route to synthesize 3,4-diunsubstitutedcoumarins through a cascade organocatalytic reaction. The reaction is catalyzed by using of a combination of benzylamine (10 mol-%) and triethylamine (10 mol-%). Various salicylaldehydes were tested, and the corresponding coumarin products were obtained in good to high yields under mild and metal-free reaction conditions.
Mg2+-Imidazole-Catalyzed Self-Condensation of Malonyl Thioesters: Getting Tuned for Biomimetic Polyketide Synthesis?
作者:Naomi Sakai、Nathalie Sordé、Stefan Matile
DOI:10.3390/61100845
日期:——
We report that a subtle balance of carbanion reactivity, leaving group activation, and pKa of the catalyst is required for efficient self-condensation of thiomalonates to thioacetoacetates in up to 71% yield under “biomimetic” conditions originally proposed by Kobuke and Yoshida (Tetrahedron Lett. 1978, 19, 367).
我们报告说,在 Kobuke 和 Yoshida 最初提出的 "仿生 "条件下(Tetrahedron Lett.)